南黄海Ms6.1地震前江苏重磁异常变化

ANOMALOUS VARIATIONS OF GRAVITY AND GEOMAGNETIC FIELDS OF JIANGSU CAUSED BY SOUTH YELLOW SEA EARTHQUAKE OF M s6.1

结合重力资料分析认为，江苏地磁异常亦与下扬子地幔流应力场活动相关。南黄海Ｍｓ６．１地震前地磁异常有呈象限分布的规律，并有发生于地磁正负变化梯度带附近的特征；重力变化打破年变规律，出现大于区域场的负异常。

Combining geomagnetic and gravity data to analyse anomaly, it is concluded that the geomagnetic anomaly of Jiangsu region is related to the stress field caused by mantle flow in lower Yangtze area. The geomagnetic anomaly exhibited a quadrantal distribution, and the law of annual variation of gravity is breaked, and regional field negative anomaly expresses gradient variation before the South Yellow Sea earthquake of M s 6.1.